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CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY (Unaudited) Parenthetical (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Change in compensation retirement benefits liability and amortization, tax	$ (1,009)	$ (34)
Nevada Power Company [Member]
Change in compensation retirement benefits liability and amortization, tax	(513)	(18)
Sierra Pacific Power Company [Member]
Change in compensation retirement benefits liability and amortization, tax	$ (1,051)	$ (9)

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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